Disk-grinder



v T. NICHOLSON.

DISK GRINDER.

APPLICATION FILED NOILZS, I9I8.

1,304,698. Patented May 21,1919.

WITNESSR IN V NTOR.

ATTORNEY. I

we NnRmS FEIERS :v pwomumon wnsnmcron. n. c.

Urnn srarns PATENT OFFICE.

TIMOTHY N ICHOLSQN, OF SCOTLAND, INDIANA.

DISK- GRINDER.

To all whom it may concern Be it known thatI, TIMOTHY NIoHoLsoN, a citizen of the United States, residing at Scotland, in the county of Greene and State of Indiana, have invented certain new and useful Improvements in Disk-Grinders, of which the following is a specification.

This invention relates to grinding, and more especially to those machines adapted to work on curved surfaces; and the object of the same is to produce an attachment for grinding cultivator disks.

A further object is to provide the attachment with adjustments, so that it is adapt ed to work on disks of various sizes.

Other objects will appear in the following specification and claims. In the drawings:

Figure 1 is a front elevation of this machine complete.

Fig. 2 is an enlarged side elevation of the head of the machine.

Fig. 3 is a plan of the attachment separated from the grinder proper.

In the drawings the numeral 1 designates a standard having bearings 2 in which is journaled a shaft 3 having a pulley 4L and an emory or grindingwheel 5, the latter by preference being at one end of the shaft. The attachment comprises a frame 10 whose base has a pair of slots 11 by means of which it may be mounted on one of the bearings, or rather one of the bolts 6 thereofas seen in Fig. 1, said frame being of U-shape with one end 12 bent horizontally and slotted as at 13 and downturned at its outer end as at 14, while the other end is given a bend 15 and then carried straight upward, as at 16. Swiveled as at 20- through the downturned end 14: is a screw 21 having a handle 22 at its outer end, while its threaded portion moves through a. nut 23 from which rises a pin 24 passing upward through the slot 13, and on this is a stop 26 held by a set screw 25 so as to adjustably support the disk indicated in dotted lines by the reference letter D. It is obvious that Specification of Letters Patent.

Patented May 27, 1919. Application filed November 26, 1918. Serial No. 264,242.

die 30 at its upper end. Its lower end is swivelly mounted in a plate 33 carrying a loop 34 adapted to be engaged beneath the outer end of a spring 35 whose inner and lower end is mounted upon one of the bolts 6 of the bearing 2 in Fig. 1. By this means the arm 32 and the elements carried thereby are moved downward with yielding force by the tension of the spring 35, but when it is disengaged from the loop 34; the arm and all parts carried by it may be swung upward out of the way; Threaded through said "arm are bolts 37 having nuts 38 above and below the arm as means for locking the bolts in adjusted position, and the lower ends of these bolts carry rollers 39 whose axes stand above the plane ofthe axis of the grinding wheel 5. By preferencev the outermost or left hand wheel directly overlies the grinder as seen in Fig. 1, whereas the other wheel is on the opposite side of a line through the pin 24. Therefore, when the disk is applied to the latter and rests upon the stop 26, the two guide wheels rest inside or on the concave side of the disk and hold it down upon the grinder; The nut 25 may be loosened and then when the grinder is rotatedby means of a belt applied to the pulley 24, its periphery not only grinds the edge of the disk, but causes the latter to turn slowly-on the pivotal support so that the edge is progres'sively sharpened as the disk turns automatically. Meanwhile the pulleys hold the disk in place, in a manner which will be clear. I prefer to employ a knuckle hinge at 36 so that when the springis detached from the loop and the arm 32 swung back, the ground disk can be replaced by one which is dull.

The foregoing description and the drawings have reference to what may 'be considered the preferred, or approved form of my invention. It is to be understood that I may make such changes in construction and arrangement and combination of parts, mate'- rials, dimensions, et cetera, as may prove expedient and fall within the scope of the apstandard having bearings, a main shaft mounted thereon, and a grinder on one end of the shaft; of a. framework of U-shape whose base is detachably connected with one of said bearings and one of whose ends extends alongside said grinder, a work holding pin carried by this end, an arm hinged to the other end of the frame and standing at right angles to the first named end, yielding means bearing this air-in normally downward, adjustable connections between said yielding means and the arm whereby the latter may be turned back on its hinge, and contact rollers carried by the hinged arm and adapted to rest on the work;

2. In a grinder, the combination with a standard having bearings, a main shaft mounted therein, and a grinder on one end of the shaft; of a framework of U-shape whose base is detachably connected with one of said bearings and one of whose ends is bent into a horizontal plane alongside said grinder, a work holding pin carried by this end, the other end of said frame being given a double bend, an arm hinged to its upper end, a screw through this arm, a loop secured on the lower end of the screw, a spring carried by the base of the frame and adapted to be engaged by said 100p, and a pair of contact rollers carried by this arm and adapted to bear upon the work.

3. In a disk grinder, the combination with a base having bearings, and a main shaft mounted therethrough and carrying a. grinder on one end; of a U-shape frame Whose base is attached to one of said bearings and whose ends are turned aside, one of them being horizontal and slotted and standing alongside the grinder, an arm hinged to the other end of the same and adapted to stand at right angles to said first-named end, a pair of work-pressing rollers carried by this arm, a work holding pin mounted in said slot, and means for adjusting the position of said pin.

f. In a disk grinding attachment, the combination with a framework whose base is adapted to be connected with a grinder, one'of its ends being turned into a horizontal plane and slotted longitudinally and then turned downward, a work-pressing roller, and means carried by the other end of the frame for supporting said roller and throwing it downward on the work; of a screw swivelly mounted through said clownturned end and cranked on its outer end, a nut engaging the threads of the screw, and a pin rising from said nut through the slot and adapted to engage the disk.

5. In a disk holding attachment for grinding machines, the combination with a framework adapted to be connected to the grinder and including a longitudinally slotted element standing alongside the grind stone and turned downward at its outer end, work pressing rollers, and means carried by the framework for supportin said rollers; of a screw swivelly mounted through said downturned end, a nut, mounted onsaid screw, a pin rising from the nut through the slot in the framework, stop on the pin above the frame work and adapted to support the disk, and a set screw in the stop against the pin.

In testimony whereof I affix my signature in presence of two witnesses. V

TIMOTHY NICHOLSON. Witnesses:

E. E. MULLIs,

CHAS. J AMESON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. C. 7 

